$\left(9x-9\right)\left(-5x+7\right)$
$\left(7x^6+4x^4\right)\cdot\left(7x^6-4x^4\right)$
$a^2x^2-8bx^2+a^2y^2-8by^2$
$36-\left(-78\right)$
$4v=12-2v$
$\cos\left(63.4\right)$
$\frac{5}{3x+2},\:c=1$
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